Other
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1589h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 9, pp.1589-1595
Other
7
Scientific paper
Analytical uncertainties in oxygen isotopic studies of hydrous silica have been investigated using a partial fluorination procedure in which fractional oxygen yields are achieved by reducing the amount of fluorine. Stepwise reaction of opaline silica results in a set of sequential oxygen fractions which show a wide range of 18 O values due to variable amounts of water, organic matter, and other impurities, -values for successive fractions in non-biogenic opal systematically increase as water is reacted away and then remain constant to within ±0.2%. as the remaining silica reacts, -values in biogenic silica increase similarly but then decrease when low 18 O oxide(?) impurities begin to react. The troublesome water component in opal is readily removed by Stepwise fluorination. This technique allows more precise oxygen isotope analysis of non-biogenic opal-A, and may improve the analytical precision for biogenic silica and any silicate mineral containing a significant water component.
Haimson Marshall
Knauth Paul L.
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